Improvement in door-locks



UNITED STATEs PATENT QFFICE.

THOMAS F.'KEATING AND WARREN H. TAYLOR, OF STAMFORD, CONN.

IMPROVEMENT IN DOOR-LOCKS.

Specification forming part of Letters Patent No. I 91, 861, dated June 12, 1877; application filed July 20, 1876.

To all whom it may concern Be it known that we, THOMAS E. KEATING and WARREN H. TAYLOR, of Stamford, in the county of Fairfield and State of Connecticut, have invented a certain new and useful Improvement in Locks, of which the following is a specification, that will enable those skilled in the art to which our improvement relates to make and use the same, reference being had to the accompanying drawings.

Our improvement is designed especially for use in connection with safe and vault doors, but may be applied elsewhere. It relates to means of attaching locks to doors; and consists in forming a screw-threaded hub or escutcheon on the back plate of a lock, projecting sufficiently to pass through a door on which it may be desired to apply the look.

We have shown such an escutcheon applied in connection with an extension of the lockcase, within which is a lock-bolt, that presents its side to dog the bolt-work, instead of its end,and-bears on its opposite side, to aid it in resisting strain applied on the bolt-work against the wall of the lock-case extension. The threaded hub or escutcheon is to be screwed into a suitable aperture in the door until it is flush with the outside, and it serves not only as an escutcheon, but, in connection with the ordinary fastening screws or bolts passing through the lock-case and into the door, as an additional security to maintain the lock firmly in its place against any strain upon the bolt-work, and, what is of especial importance, it prevents driving off the look by applying force to the hub.

In the drawings, Figure 1 is a view of the inside of an ordinary safe-door with our improved lock applied, and Fig. 2 is a transverse section through the line as w of Fig. 1.

A represents the door; B B, the bolt-work or train of bolts; 0 thelock, and I) the screwthreaded escutcheon. The lock-case is provided with an extension, 0, at its upper end, having a recess for receiving the lock-bolt-b when thrown by the key into the locked posian aperture, forming a bearin g for the tongue B, which, as shown, is a part of the train of door-bolts. F

The operation of looking, as we have illus trated it, is that, when the door is closed and the door-bolts have been thrown forward in the usual way into engagement with the jamb,

the application of the key from the outside throws the lock-bolt up behind the tongue B, causing the side of the lock-bolt to bear against the end of the tongue B, and firmly dog the the recess or mortise of the lock-case extension, thereby relieving the lock mechanism from all strain, and confining the strain to the lock-case extension and the strong fastenings of the lock-case.

We do not confineourselves to any special locking mechanism to be operated by a key to throw the lock-bolt, but design to employ any of the well-known forms of locking mech' anism that may be convenient for operating reciprocating sliding lock-bolts.

We do not claim to be the first to use the side of a lock-bolt to dog safe bolt-work, or to be the first to provide a mere screw-threaded hub or projection on the back plate of a lockcase, for we are aware that those things have been done before; but

What we claim as our improvement, and desire to secure by Letters Patent, is-

A lock-case provided with a screw-threaded escutcheon integral therewith, to pass into and through an aperture in a door for direct attachment of a lock to a door, substantially 

